EQ question

  • Thread starter Thread starter RideTheCrash
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RideTheCrash

RideTheCrash

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This something I've always wondered. People will also say things like "I cut 250-500 Hz" etc. I know what that means, but with my EG knobs on my board I dunno what's what. I know my example is like the lower frequencies...

My board has the following EQ: hi, hi mid, mid, tune and lo. It's not like it's labelled 500 Hz etc, so can anyone help me or point me somewhere?
 
The board's documentation should tell you what the EQ ranges are (and whether the central frequency is selectable and/or the width of the band is adjustable).
 
Well I looked it up in the manual and it says...

"Each band of the active 4-band equalizer provides and +15 dB cut and boost. The mid-band E.Q. features a frequency TUNE control for a semi-parametric equalization of the low (150 Hz) to upper-mid (3.3 K.Hz) range where feedback and and acoustic overtones require the most specific adjustments. The three remaining E.Q. controls have fixed center frequencies at 80 Hz (LO), 5 K.Hz (HI MID), and 12 K.Hz (HI)."

So...it's fixed. I still don't know what that means etc, help?
 
OK, it means:

Each know can boost and cut 15 dB. Each knob is centered around some frequency and has some width within which the boost or cut operates. The three fixed knobs control the frequency bands centered around 80 Hz, 5000 Hz, and 12000 Hz. So, if you turn the Lo knob, you are cutting or boosting the volume of frequencies centered around 80 Hz.

The mid-band EQ has a center frequency that can be moved from 150 Hz to 3.3 kHz using the Frequency Tune control. In other words, the knob will cut or boost in a band around 150 Hz, or in a band around 3300 Hz, or in a band around any frequency in between 150-3300 Hz depending on how you adjust this Tune control.
 
No, three are fixed and one is sweepable. The 80hz low is a fixed shelf type of control as is the 12khz control. That means on the low control when you boost it, 80hz and everything below it is boosted like a shelf. On the hi EQ 12 khz and everything above it gets boosted (or cut as the case may be). This boost and cut isn't JUST at 80hz or 12khz. The filters in the EQ circuit have a slope of so many db per octave. The fixed hi mid band EQ is a band notch/boost set up where it has a fixed center frequency of 5khz and will only boost or cut so many octaves above and below the center freq (only the spec sheet that came with it can tell you how many octaves wide the filter is). Your last EQ should have two nobs associated with it. One is the amount of boost and cut and the other is the sweep control that MOVES the center frequency of what is to be boosted or cut. So when someone says they're boosting 250hz, they're sweeping the center freq to 250hz and then boosting.
 
My brain is trying to grasp that, lol. I was reading Slackmasters excellent page on EQ drums and he'd put things like, so I was curious.
 
I did say three are fixed... but I was wrong about the nature of their action on the low and high frequencies. I didn't realize that those two boost or cut everything below (for the Lo) or above (for the Hi). I'm really sorry to have muddied the waters here, RideTheCrash.
 
It's no problem, I really appreciate all the help I get, heh.
 
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